I got this fire alarm, which is very common in people’s lives. In fact, I even have one of the same brand in my room. This made me curious about its internal structure and how it operates.Let’s do this!
The tools used：
- Needle-nose pliers
- flathead screwdriver
- Phillips screwdriver
Teardown steps：
1.Remove the battery cover
2.Use a flathead wrench to remove the alarm cover
3.Use a Phillips screwdriver to remove the circuit board and speaker.And that’s it!
The materials used for each component
| component | material | techniques/equipment |
| Main Circuit Board | Epoxy resin, copper, electronic components | PCB fabrication, etching, soldering |
| Smoke Detector Sensor | Photoelectric sensors, semiconductors | Sensor assembly, integration of photodiodes |
| CO Detector Sensor | Electrochemical cells | Electrochemical assembly, electrode preparation |
| Speaker | Plastic, magnet, diaphragm | Injection molding, assembly, tuning |
| Battery Compartment | Plastic | Injection molding |
| Test/Reset Button | Plastic | Injection molding |
| Indicator Light | LED, plastic lens | LED assembly, plastic molding |
| Mounting Base | Plastic | Injection molding |
| Alarm Housing | Plastic | Injection molding |
Chips
PCBA2544-9782A FW 2544-5?81 B 011015 ??
Design elements
1.I think the structural design of the alarm is very easy to install and use. The user interface is simple and clear, consisting of a speaker (for alarm sounds) and LED lights. The alarm sound or signal is sufficiently noticeable to ensure it can be easily detected in emergency situations.
2.The Kidde alarm integrates smoke detection and carbon monoxide detection into a single unit. It uses an ionization sensor to detect fires and an electrochemical sensor to detect carbon monoxide. This combination provides a more comprehensive response to the two main hazards in a home.(Specific details are provided by Amazon)